Commit | Line | Data |
---|---|---|
ccf06998 | 1 | /* |
575c5807 | 2 | * MPC8xxx SPI controller driver. |
ccf06998 KG |
3 | * |
4 | * Maintainer: Kumar Gala | |
5 | * | |
6 | * Copyright (C) 2006 Polycom, Inc. | |
7 | * | |
4c1fba44 AV |
8 | * CPM SPI and QE buffer descriptors mode support: |
9 | * Copyright (c) 2009 MontaVista Software, Inc. | |
10 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
11 | * | |
ccf06998 KG |
12 | * This program is free software; you can redistribute it and/or modify it |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | */ | |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
fd8a11e1 | 21 | #include <linux/bug.h> |
35b4b3c0 AV |
22 | #include <linux/errno.h> |
23 | #include <linux/err.h> | |
9effb959 | 24 | #include <linux/io.h> |
ccf06998 KG |
25 | #include <linux/completion.h> |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/spi/spi.h> | |
31 | #include <linux/spi/spi_bitbang.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/fsl_devices.h> | |
4c1fba44 AV |
34 | #include <linux/dma-mapping.h> |
35 | #include <linux/mm.h> | |
36 | #include <linux/mutex.h> | |
35b4b3c0 AV |
37 | #include <linux/of.h> |
38 | #include <linux/of_platform.h> | |
39 | #include <linux/gpio.h> | |
40 | #include <linux/of_gpio.h> | |
41 | #include <linux/of_spi.h> | |
5a0e3ad6 | 42 | #include <linux/slab.h> |
ccf06998 | 43 | |
35b4b3c0 | 44 | #include <sysdev/fsl_soc.h> |
4c1fba44 AV |
45 | #include <asm/cpm.h> |
46 | #include <asm/qe.h> | |
ccf06998 | 47 | #include <asm/irq.h> |
ccf06998 | 48 | |
4c1fba44 AV |
49 | /* CPM1 and CPM2 are mutually exclusive. */ |
50 | #ifdef CONFIG_CPM1 | |
51 | #include <asm/cpm1.h> | |
52 | #define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0) | |
53 | #else | |
54 | #include <asm/cpm2.h> | |
55 | #define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0) | |
56 | #endif | |
57 | ||
ccf06998 | 58 | /* SPI Controller registers */ |
575c5807 | 59 | struct mpc8xxx_spi_reg { |
ccf06998 KG |
60 | u8 res1[0x20]; |
61 | __be32 mode; | |
62 | __be32 event; | |
63 | __be32 mask; | |
64 | __be32 command; | |
65 | __be32 transmit; | |
66 | __be32 receive; | |
67 | }; | |
68 | ||
4c1fba44 AV |
69 | /* SPI Parameter RAM */ |
70 | struct spi_pram { | |
71 | __be16 rbase; /* Rx Buffer descriptor base address */ | |
72 | __be16 tbase; /* Tx Buffer descriptor base address */ | |
73 | u8 rfcr; /* Rx function code */ | |
74 | u8 tfcr; /* Tx function code */ | |
75 | __be16 mrblr; /* Max receive buffer length */ | |
76 | __be32 rstate; /* Internal */ | |
77 | __be32 rdp; /* Internal */ | |
78 | __be16 rbptr; /* Internal */ | |
79 | __be16 rbc; /* Internal */ | |
80 | __be32 rxtmp; /* Internal */ | |
81 | __be32 tstate; /* Internal */ | |
82 | __be32 tdp; /* Internal */ | |
83 | __be16 tbptr; /* Internal */ | |
84 | __be16 tbc; /* Internal */ | |
85 | __be32 txtmp; /* Internal */ | |
86 | __be32 res; /* Tx temp. */ | |
87 | __be16 rpbase; /* Relocation pointer (CPM1 only) */ | |
88 | __be16 res1; /* Reserved */ | |
89 | }; | |
90 | ||
ccf06998 | 91 | /* SPI Controller mode register definitions */ |
2a485d7a | 92 | #define SPMODE_LOOP (1 << 30) |
ccf06998 KG |
93 | #define SPMODE_CI_INACTIVEHIGH (1 << 29) |
94 | #define SPMODE_CP_BEGIN_EDGECLK (1 << 28) | |
95 | #define SPMODE_DIV16 (1 << 27) | |
96 | #define SPMODE_REV (1 << 26) | |
97 | #define SPMODE_MS (1 << 25) | |
98 | #define SPMODE_ENABLE (1 << 24) | |
99 | #define SPMODE_LEN(x) ((x) << 20) | |
100 | #define SPMODE_PM(x) ((x) << 16) | |
f29ba280 | 101 | #define SPMODE_OP (1 << 14) |
c9bfcb31 | 102 | #define SPMODE_CG(x) ((x) << 7) |
ccf06998 KG |
103 | |
104 | /* | |
105 | * Default for SPI Mode: | |
106 | * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk | |
107 | */ | |
108 | #define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \ | |
109 | SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf)) | |
110 | ||
111 | /* SPIE register values */ | |
112 | #define SPIE_NE 0x00000200 /* Not empty */ | |
113 | #define SPIE_NF 0x00000100 /* Not full */ | |
114 | ||
115 | /* SPIM register values */ | |
116 | #define SPIM_NE 0x00000200 /* Not empty */ | |
117 | #define SPIM_NF 0x00000100 /* Not full */ | |
118 | ||
4c1fba44 AV |
119 | #define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */ |
120 | #define SPIE_RXB 0x00000100 /* Last char is written to rx buf */ | |
121 | ||
122 | /* SPCOM register values */ | |
123 | #define SPCOM_STR (1 << 23) /* Start transmit */ | |
124 | ||
125 | #define SPI_PRAM_SIZE 0x100 | |
126 | #define SPI_MRBLR ((unsigned int)PAGE_SIZE) | |
127 | ||
ccf06998 | 128 | /* SPI Controller driver's private data. */ |
575c5807 | 129 | struct mpc8xxx_spi { |
4c1fba44 | 130 | struct device *dev; |
575c5807 | 131 | struct mpc8xxx_spi_reg __iomem *base; |
ccf06998 KG |
132 | |
133 | /* rx & tx bufs from the spi_transfer */ | |
134 | const void *tx; | |
135 | void *rx; | |
136 | ||
4c1fba44 AV |
137 | int subblock; |
138 | struct spi_pram __iomem *pram; | |
139 | struct cpm_buf_desc __iomem *tx_bd; | |
140 | struct cpm_buf_desc __iomem *rx_bd; | |
141 | ||
142 | struct spi_transfer *xfer_in_progress; | |
143 | ||
144 | /* dma addresses for CPM transfers */ | |
145 | dma_addr_t tx_dma; | |
146 | dma_addr_t rx_dma; | |
147 | bool map_tx_dma; | |
148 | bool map_rx_dma; | |
149 | ||
150 | dma_addr_t dma_dummy_tx; | |
151 | dma_addr_t dma_dummy_rx; | |
152 | ||
ccf06998 | 153 | /* functions to deal with different sized buffers */ |
575c5807 AV |
154 | void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); |
155 | u32(*get_tx) (struct mpc8xxx_spi *); | |
ccf06998 KG |
156 | |
157 | unsigned int count; | |
35b4b3c0 | 158 | unsigned int irq; |
ccf06998 KG |
159 | |
160 | unsigned nsecs; /* (clock cycle time)/2 */ | |
161 | ||
e24a4d1e | 162 | u32 spibrg; /* SPIBRG input clock */ |
f29ba280 JT |
163 | u32 rx_shift; /* RX data reg shift when in qe mode */ |
164 | u32 tx_shift; /* TX data reg shift when in qe mode */ | |
165 | ||
87ec0e98 | 166 | unsigned int flags; |
f29ba280 | 167 | |
c9bfcb31 JT |
168 | struct workqueue_struct *workqueue; |
169 | struct work_struct work; | |
170 | ||
171 | struct list_head queue; | |
172 | spinlock_t lock; | |
173 | ||
174 | struct completion done; | |
175 | }; | |
176 | ||
4c1fba44 AV |
177 | static void *mpc8xxx_dummy_rx; |
178 | static DEFINE_MUTEX(mpc8xxx_dummy_rx_lock); | |
179 | static int mpc8xxx_dummy_rx_refcnt; | |
180 | ||
575c5807 | 181 | struct spi_mpc8xxx_cs { |
c9bfcb31 | 182 | /* functions to deal with different sized buffers */ |
575c5807 AV |
183 | void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *); |
184 | u32 (*get_tx) (struct mpc8xxx_spi *); | |
c9bfcb31 JT |
185 | u32 rx_shift; /* RX data reg shift when in qe mode */ |
186 | u32 tx_shift; /* TX data reg shift when in qe mode */ | |
187 | u32 hw_mode; /* Holds HW mode register settings */ | |
ccf06998 KG |
188 | }; |
189 | ||
575c5807 | 190 | static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val) |
ccf06998 KG |
191 | { |
192 | out_be32(reg, val); | |
193 | } | |
194 | ||
575c5807 | 195 | static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg) |
ccf06998 KG |
196 | { |
197 | return in_be32(reg); | |
198 | } | |
199 | ||
200 | #define MPC83XX_SPI_RX_BUF(type) \ | |
34c8a20c | 201 | static \ |
575c5807 | 202 | void mpc8xxx_spi_rx_buf_##type(u32 data, struct mpc8xxx_spi *mpc8xxx_spi) \ |
ccf06998 | 203 | { \ |
575c5807 AV |
204 | type *rx = mpc8xxx_spi->rx; \ |
205 | *rx++ = (type)(data >> mpc8xxx_spi->rx_shift); \ | |
206 | mpc8xxx_spi->rx = rx; \ | |
ccf06998 KG |
207 | } |
208 | ||
209 | #define MPC83XX_SPI_TX_BUF(type) \ | |
34c8a20c | 210 | static \ |
575c5807 | 211 | u32 mpc8xxx_spi_tx_buf_##type(struct mpc8xxx_spi *mpc8xxx_spi) \ |
ccf06998 KG |
212 | { \ |
213 | u32 data; \ | |
575c5807 | 214 | const type *tx = mpc8xxx_spi->tx; \ |
4b1badf5 DB |
215 | if (!tx) \ |
216 | return 0; \ | |
575c5807 AV |
217 | data = *tx++ << mpc8xxx_spi->tx_shift; \ |
218 | mpc8xxx_spi->tx = tx; \ | |
ccf06998 KG |
219 | return data; \ |
220 | } | |
221 | ||
222 | MPC83XX_SPI_RX_BUF(u8) | |
223 | MPC83XX_SPI_RX_BUF(u16) | |
224 | MPC83XX_SPI_RX_BUF(u32) | |
225 | MPC83XX_SPI_TX_BUF(u8) | |
226 | MPC83XX_SPI_TX_BUF(u16) | |
227 | MPC83XX_SPI_TX_BUF(u32) | |
228 | ||
a35c1710 AV |
229 | static void mpc8xxx_spi_change_mode(struct spi_device *spi) |
230 | { | |
231 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); | |
232 | struct spi_mpc8xxx_cs *cs = spi->controller_state; | |
233 | __be32 __iomem *mode = &mspi->base->mode; | |
234 | unsigned long flags; | |
235 | ||
236 | if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) | |
237 | return; | |
238 | ||
239 | /* Turn off IRQs locally to minimize time that SPI is disabled. */ | |
240 | local_irq_save(flags); | |
241 | ||
242 | /* Turn off SPI unit prior changing mode */ | |
243 | mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); | |
a35c1710 | 244 | |
4c1fba44 AV |
245 | /* When in CPM mode, we need to reinit tx and rx. */ |
246 | if (mspi->flags & SPI_CPM_MODE) { | |
247 | if (mspi->flags & SPI_QE) { | |
248 | qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock, | |
249 | QE_CR_PROTOCOL_UNSPECIFIED, 0); | |
250 | } else { | |
251 | cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX); | |
252 | if (mspi->flags & SPI_CPM1) { | |
253 | out_be16(&mspi->pram->rbptr, | |
254 | in_be16(&mspi->pram->rbase)); | |
255 | out_be16(&mspi->pram->tbptr, | |
256 | in_be16(&mspi->pram->tbase)); | |
257 | } | |
258 | } | |
259 | } | |
f9218c2a | 260 | mpc8xxx_spi_write_reg(mode, cs->hw_mode); |
a35c1710 AV |
261 | local_irq_restore(flags); |
262 | } | |
263 | ||
575c5807 | 264 | static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value) |
ccf06998 | 265 | { |
575c5807 | 266 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); |
364fdbc0 AV |
267 | struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data; |
268 | bool pol = spi->mode & SPI_CS_HIGH; | |
575c5807 | 269 | struct spi_mpc8xxx_cs *cs = spi->controller_state; |
ccf06998 | 270 | |
ccf06998 | 271 | if (value == BITBANG_CS_INACTIVE) { |
364fdbc0 AV |
272 | if (pdata->cs_control) |
273 | pdata->cs_control(spi, !pol); | |
ccf06998 KG |
274 | } |
275 | ||
276 | if (value == BITBANG_CS_ACTIVE) { | |
575c5807 AV |
277 | mpc8xxx_spi->rx_shift = cs->rx_shift; |
278 | mpc8xxx_spi->tx_shift = cs->tx_shift; | |
279 | mpc8xxx_spi->get_rx = cs->get_rx; | |
280 | mpc8xxx_spi->get_tx = cs->get_tx; | |
c9bfcb31 | 281 | |
a35c1710 AV |
282 | mpc8xxx_spi_change_mode(spi); |
283 | ||
364fdbc0 AV |
284 | if (pdata->cs_control) |
285 | pdata->cs_control(spi, pol); | |
ccf06998 KG |
286 | } |
287 | } | |
288 | ||
289 | static | |
575c5807 | 290 | int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) |
ccf06998 | 291 | { |
575c5807 | 292 | struct mpc8xxx_spi *mpc8xxx_spi; |
c9bfcb31 | 293 | u8 bits_per_word, pm; |
ccf06998 | 294 | u32 hz; |
575c5807 | 295 | struct spi_mpc8xxx_cs *cs = spi->controller_state; |
ccf06998 | 296 | |
575c5807 | 297 | mpc8xxx_spi = spi_master_get_devdata(spi->master); |
ccf06998 KG |
298 | |
299 | if (t) { | |
300 | bits_per_word = t->bits_per_word; | |
301 | hz = t->speed_hz; | |
302 | } else { | |
303 | bits_per_word = 0; | |
304 | hz = 0; | |
305 | } | |
306 | ||
307 | /* spi_transfer level calls that work per-word */ | |
308 | if (!bits_per_word) | |
309 | bits_per_word = spi->bits_per_word; | |
310 | ||
311 | /* Make sure its a bit width we support [4..16, 32] */ | |
312 | if ((bits_per_word < 4) | |
313 | || ((bits_per_word > 16) && (bits_per_word != 32))) | |
314 | return -EINVAL; | |
315 | ||
c9bfcb31 JT |
316 | if (!hz) |
317 | hz = spi->max_speed_hz; | |
318 | ||
319 | cs->rx_shift = 0; | |
320 | cs->tx_shift = 0; | |
ccf06998 | 321 | if (bits_per_word <= 8) { |
575c5807 AV |
322 | cs->get_rx = mpc8xxx_spi_rx_buf_u8; |
323 | cs->get_tx = mpc8xxx_spi_tx_buf_u8; | |
87ec0e98 | 324 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { |
c9bfcb31 JT |
325 | cs->rx_shift = 16; |
326 | cs->tx_shift = 24; | |
f29ba280 | 327 | } |
ccf06998 | 328 | } else if (bits_per_word <= 16) { |
575c5807 AV |
329 | cs->get_rx = mpc8xxx_spi_rx_buf_u16; |
330 | cs->get_tx = mpc8xxx_spi_tx_buf_u16; | |
87ec0e98 | 331 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { |
c9bfcb31 JT |
332 | cs->rx_shift = 16; |
333 | cs->tx_shift = 16; | |
f29ba280 | 334 | } |
ccf06998 | 335 | } else if (bits_per_word <= 32) { |
575c5807 AV |
336 | cs->get_rx = mpc8xxx_spi_rx_buf_u32; |
337 | cs->get_tx = mpc8xxx_spi_tx_buf_u32; | |
ccf06998 KG |
338 | } else |
339 | return -EINVAL; | |
340 | ||
87ec0e98 AV |
341 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE && |
342 | spi->mode & SPI_LSB_FIRST) { | |
c9bfcb31 | 343 | cs->tx_shift = 0; |
35cc0b97 | 344 | if (bits_per_word <= 8) |
c9bfcb31 | 345 | cs->rx_shift = 8; |
35cc0b97 | 346 | else |
c9bfcb31 | 347 | cs->rx_shift = 0; |
35cc0b97 AV |
348 | } |
349 | ||
575c5807 AV |
350 | mpc8xxx_spi->rx_shift = cs->rx_shift; |
351 | mpc8xxx_spi->tx_shift = cs->tx_shift; | |
352 | mpc8xxx_spi->get_rx = cs->get_rx; | |
353 | mpc8xxx_spi->get_tx = cs->get_tx; | |
ccf06998 KG |
354 | |
355 | if (bits_per_word == 32) | |
356 | bits_per_word = 0; | |
357 | else | |
358 | bits_per_word = bits_per_word - 1; | |
359 | ||
32421daa | 360 | /* mask out bits we are going to set */ |
c9bfcb31 JT |
361 | cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 |
362 | | SPMODE_PM(0xF)); | |
363 | ||
364 | cs->hw_mode |= SPMODE_LEN(bits_per_word); | |
365 | ||
575c5807 | 366 | if ((mpc8xxx_spi->spibrg / hz) > 64) { |
53604dbe | 367 | cs->hw_mode |= SPMODE_DIV16; |
4f4517c4 | 368 | pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; |
fd8a11e1 AV |
369 | |
370 | WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " | |
371 | "Will use %d Hz instead.\n", dev_name(&spi->dev), | |
575c5807 | 372 | hz, mpc8xxx_spi->spibrg / 1024); |
fd8a11e1 | 373 | if (pm > 16) |
53604dbe | 374 | pm = 16; |
a61f5345 | 375 | } else |
4f4517c4 | 376 | pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; |
a61f5345 CG |
377 | if (pm) |
378 | pm--; | |
379 | ||
380 | cs->hw_mode |= SPMODE_PM(pm); | |
a35c1710 AV |
381 | |
382 | mpc8xxx_spi_change_mode(spi); | |
c9bfcb31 JT |
383 | return 0; |
384 | } | |
ccf06998 | 385 | |
4c1fba44 | 386 | static void mpc8xxx_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) |
c9bfcb31 | 387 | { |
4c1fba44 AV |
388 | struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd; |
389 | struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd; | |
390 | unsigned int xfer_len = min(mspi->count, SPI_MRBLR); | |
391 | unsigned int xfer_ofs; | |
ccf06998 | 392 | |
4c1fba44 AV |
393 | xfer_ofs = mspi->xfer_in_progress->len - mspi->count; |
394 | ||
395 | out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs); | |
396 | out_be16(&rx_bd->cbd_datlen, 0); | |
397 | out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP); | |
398 | ||
399 | out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs); | |
400 | out_be16(&tx_bd->cbd_datlen, xfer_len); | |
401 | out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | | |
402 | BD_SC_LAST); | |
403 | ||
404 | /* start transfer */ | |
405 | mpc8xxx_spi_write_reg(&mspi->base->command, SPCOM_STR); | |
406 | } | |
407 | ||
408 | static int mpc8xxx_spi_cpm_bufs(struct mpc8xxx_spi *mspi, | |
409 | struct spi_transfer *t, bool is_dma_mapped) | |
410 | { | |
411 | struct device *dev = mspi->dev; | |
412 | ||
413 | if (is_dma_mapped) { | |
414 | mspi->map_tx_dma = 0; | |
415 | mspi->map_rx_dma = 0; | |
416 | } else { | |
417 | mspi->map_tx_dma = 1; | |
418 | mspi->map_rx_dma = 1; | |
419 | } | |
420 | ||
421 | if (!t->tx_buf) { | |
422 | mspi->tx_dma = mspi->dma_dummy_tx; | |
423 | mspi->map_tx_dma = 0; | |
424 | } | |
425 | ||
426 | if (!t->rx_buf) { | |
427 | mspi->rx_dma = mspi->dma_dummy_rx; | |
428 | mspi->map_rx_dma = 0; | |
429 | } | |
430 | ||
431 | if (mspi->map_tx_dma) { | |
432 | void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */ | |
433 | ||
434 | mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len, | |
435 | DMA_TO_DEVICE); | |
436 | if (dma_mapping_error(dev, mspi->tx_dma)) { | |
437 | dev_err(dev, "unable to map tx dma\n"); | |
438 | return -ENOMEM; | |
439 | } | |
f9218c2a | 440 | } else if (t->tx_buf) { |
4c1fba44 AV |
441 | mspi->tx_dma = t->tx_dma; |
442 | } | |
443 | ||
444 | if (mspi->map_rx_dma) { | |
445 | mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len, | |
446 | DMA_FROM_DEVICE); | |
447 | if (dma_mapping_error(dev, mspi->rx_dma)) { | |
448 | dev_err(dev, "unable to map rx dma\n"); | |
449 | goto err_rx_dma; | |
450 | } | |
f9218c2a | 451 | } else if (t->rx_buf) { |
4c1fba44 AV |
452 | mspi->rx_dma = t->rx_dma; |
453 | } | |
454 | ||
455 | /* enable rx ints */ | |
456 | mpc8xxx_spi_write_reg(&mspi->base->mask, SPIE_RXB); | |
457 | ||
458 | mspi->xfer_in_progress = t; | |
459 | mspi->count = t->len; | |
460 | ||
461 | /* start CPM transfers */ | |
462 | mpc8xxx_spi_cpm_bufs_start(mspi); | |
463 | ||
464 | return 0; | |
465 | ||
466 | err_rx_dma: | |
467 | if (mspi->map_tx_dma) | |
468 | dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); | |
469 | return -ENOMEM; | |
470 | } | |
471 | ||
472 | static void mpc8xxx_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) | |
473 | { | |
474 | struct device *dev = mspi->dev; | |
475 | struct spi_transfer *t = mspi->xfer_in_progress; | |
476 | ||
477 | if (mspi->map_tx_dma) | |
478 | dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); | |
479 | if (mspi->map_tx_dma) | |
480 | dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE); | |
481 | mspi->xfer_in_progress = NULL; | |
482 | } | |
483 | ||
484 | static int mpc8xxx_spi_cpu_bufs(struct mpc8xxx_spi *mspi, | |
485 | struct spi_transfer *t, unsigned int len) | |
486 | { | |
487 | u32 word; | |
488 | ||
489 | mspi->count = len; | |
490 | ||
491 | /* enable rx ints */ | |
492 | mpc8xxx_spi_write_reg(&mspi->base->mask, SPIM_NE); | |
493 | ||
494 | /* transmit word */ | |
495 | word = mspi->get_tx(mspi); | |
496 | mpc8xxx_spi_write_reg(&mspi->base->transmit, word); | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static int mpc8xxx_spi_bufs(struct spi_device *spi, struct spi_transfer *t, | |
502 | bool is_dma_mapped) | |
503 | { | |
504 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
505 | unsigned int len = t->len; | |
506 | u8 bits_per_word; | |
507 | int ret; | |
c9bfcb31 | 508 | |
c9bfcb31 JT |
509 | bits_per_word = spi->bits_per_word; |
510 | if (t->bits_per_word) | |
511 | bits_per_word = t->bits_per_word; | |
4c1fba44 | 512 | |
aa77d96b PK |
513 | if (bits_per_word > 8) { |
514 | /* invalid length? */ | |
515 | if (len & 1) | |
516 | return -EINVAL; | |
c9bfcb31 | 517 | len /= 2; |
aa77d96b PK |
518 | } |
519 | if (bits_per_word > 16) { | |
520 | /* invalid length? */ | |
521 | if (len & 1) | |
522 | return -EINVAL; | |
c9bfcb31 | 523 | len /= 2; |
aa77d96b | 524 | } |
aa77d96b | 525 | |
4c1fba44 AV |
526 | mpc8xxx_spi->tx = t->tx_buf; |
527 | mpc8xxx_spi->rx = t->rx_buf; | |
c9bfcb31 | 528 | |
4c1fba44 | 529 | INIT_COMPLETION(mpc8xxx_spi->done); |
c9bfcb31 | 530 | |
4c1fba44 AV |
531 | if (mpc8xxx_spi->flags & SPI_CPM_MODE) |
532 | ret = mpc8xxx_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); | |
533 | else | |
534 | ret = mpc8xxx_spi_cpu_bufs(mpc8xxx_spi, t, len); | |
535 | if (ret) | |
536 | return ret; | |
c9bfcb31 | 537 | |
575c5807 | 538 | wait_for_completion(&mpc8xxx_spi->done); |
c9bfcb31 JT |
539 | |
540 | /* disable rx ints */ | |
575c5807 | 541 | mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0); |
c9bfcb31 | 542 | |
4c1fba44 AV |
543 | if (mpc8xxx_spi->flags & SPI_CPM_MODE) |
544 | mpc8xxx_spi_cpm_bufs_complete(mpc8xxx_spi); | |
545 | ||
575c5807 | 546 | return mpc8xxx_spi->count; |
c9bfcb31 JT |
547 | } |
548 | ||
575c5807 | 549 | static void mpc8xxx_spi_do_one_msg(struct spi_message *m) |
c9bfcb31 | 550 | { |
b9b9af11 AV |
551 | struct spi_device *spi = m->spi; |
552 | struct spi_transfer *t; | |
553 | unsigned int cs_change; | |
554 | const int nsecs = 50; | |
555 | int status; | |
556 | ||
557 | cs_change = 1; | |
558 | status = 0; | |
559 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
560 | if (t->bits_per_word || t->speed_hz) { | |
561 | /* Don't allow changes if CS is active */ | |
562 | status = -EINVAL; | |
563 | ||
564 | if (cs_change) | |
575c5807 | 565 | status = mpc8xxx_spi_setup_transfer(spi, t); |
b9b9af11 | 566 | if (status < 0) |
c9bfcb31 | 567 | break; |
b9b9af11 | 568 | } |
c9bfcb31 | 569 | |
b9b9af11 | 570 | if (cs_change) { |
575c5807 | 571 | mpc8xxx_spi_chipselect(spi, BITBANG_CS_ACTIVE); |
b9b9af11 AV |
572 | ndelay(nsecs); |
573 | } | |
574 | cs_change = t->cs_change; | |
575 | if (t->len) | |
4c1fba44 | 576 | status = mpc8xxx_spi_bufs(spi, t, m->is_dma_mapped); |
b9b9af11 AV |
577 | if (status) { |
578 | status = -EMSGSIZE; | |
579 | break; | |
c9bfcb31 | 580 | } |
b9b9af11 | 581 | m->actual_length += t->len; |
c9bfcb31 | 582 | |
b9b9af11 AV |
583 | if (t->delay_usecs) |
584 | udelay(t->delay_usecs); | |
c9bfcb31 | 585 | |
b9b9af11 | 586 | if (cs_change) { |
c9bfcb31 | 587 | ndelay(nsecs); |
575c5807 | 588 | mpc8xxx_spi_chipselect(spi, BITBANG_CS_INACTIVE); |
b9b9af11 | 589 | ndelay(nsecs); |
c9bfcb31 | 590 | } |
b9b9af11 AV |
591 | } |
592 | ||
593 | m->status = status; | |
594 | m->complete(m->context); | |
595 | ||
596 | if (status || !cs_change) { | |
597 | ndelay(nsecs); | |
575c5807 | 598 | mpc8xxx_spi_chipselect(spi, BITBANG_CS_INACTIVE); |
b9b9af11 AV |
599 | } |
600 | ||
575c5807 | 601 | mpc8xxx_spi_setup_transfer(spi, NULL); |
b9b9af11 AV |
602 | } |
603 | ||
575c5807 | 604 | static void mpc8xxx_spi_work(struct work_struct *work) |
b9b9af11 | 605 | { |
575c5807 | 606 | struct mpc8xxx_spi *mpc8xxx_spi = container_of(work, struct mpc8xxx_spi, |
b9b9af11 AV |
607 | work); |
608 | ||
575c5807 AV |
609 | spin_lock_irq(&mpc8xxx_spi->lock); |
610 | while (!list_empty(&mpc8xxx_spi->queue)) { | |
611 | struct spi_message *m = container_of(mpc8xxx_spi->queue.next, | |
b9b9af11 AV |
612 | struct spi_message, queue); |
613 | ||
614 | list_del_init(&m->queue); | |
575c5807 | 615 | spin_unlock_irq(&mpc8xxx_spi->lock); |
c9bfcb31 | 616 | |
575c5807 | 617 | mpc8xxx_spi_do_one_msg(m); |
c9bfcb31 | 618 | |
575c5807 | 619 | spin_lock_irq(&mpc8xxx_spi->lock); |
c9bfcb31 | 620 | } |
575c5807 | 621 | spin_unlock_irq(&mpc8xxx_spi->lock); |
ccf06998 KG |
622 | } |
623 | ||
575c5807 | 624 | static int mpc8xxx_spi_setup(struct spi_device *spi) |
ccf06998 | 625 | { |
575c5807 | 626 | struct mpc8xxx_spi *mpc8xxx_spi; |
ccf06998 | 627 | int retval; |
c9bfcb31 | 628 | u32 hw_mode; |
575c5807 | 629 | struct spi_mpc8xxx_cs *cs = spi->controller_state; |
ccf06998 KG |
630 | |
631 | if (!spi->max_speed_hz) | |
632 | return -EINVAL; | |
633 | ||
c9bfcb31 JT |
634 | if (!cs) { |
635 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
636 | if (!cs) | |
637 | return -ENOMEM; | |
638 | spi->controller_state = cs; | |
639 | } | |
575c5807 | 640 | mpc8xxx_spi = spi_master_get_devdata(spi->master); |
ccf06998 | 641 | |
c9bfcb31 | 642 | hw_mode = cs->hw_mode; /* Save orginal settings */ |
575c5807 | 643 | cs->hw_mode = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode); |
c9bfcb31 JT |
644 | /* mask out bits we are going to set */ |
645 | cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH | |
646 | | SPMODE_REV | SPMODE_LOOP); | |
647 | ||
648 | if (spi->mode & SPI_CPHA) | |
649 | cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; | |
650 | if (spi->mode & SPI_CPOL) | |
651 | cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; | |
652 | if (!(spi->mode & SPI_LSB_FIRST)) | |
653 | cs->hw_mode |= SPMODE_REV; | |
654 | if (spi->mode & SPI_LOOP) | |
655 | cs->hw_mode |= SPMODE_LOOP; | |
656 | ||
575c5807 | 657 | retval = mpc8xxx_spi_setup_transfer(spi, NULL); |
c9bfcb31 JT |
658 | if (retval < 0) { |
659 | cs->hw_mode = hw_mode; /* Restore settings */ | |
ccf06998 | 660 | return retval; |
c9bfcb31 | 661 | } |
ccf06998 KG |
662 | return 0; |
663 | } | |
664 | ||
4c1fba44 | 665 | static void mpc8xxx_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events) |
ccf06998 | 666 | { |
4c1fba44 | 667 | u16 len; |
ccf06998 | 668 | |
4c1fba44 AV |
669 | dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__, |
670 | in_be16(&mspi->rx_bd->cbd_datlen), mspi->count); | |
ccf06998 | 671 | |
4c1fba44 AV |
672 | len = in_be16(&mspi->rx_bd->cbd_datlen); |
673 | if (len > mspi->count) { | |
674 | WARN_ON(1); | |
675 | len = mspi->count; | |
676 | } | |
ccf06998 | 677 | |
4c1fba44 AV |
678 | /* Clear the events */ |
679 | mpc8xxx_spi_write_reg(&mspi->base->event, events); | |
ccf06998 | 680 | |
4c1fba44 AV |
681 | mspi->count -= len; |
682 | if (mspi->count) | |
683 | mpc8xxx_spi_cpm_bufs_start(mspi); | |
684 | else | |
685 | complete(&mspi->done); | |
686 | } | |
687 | ||
688 | static void mpc8xxx_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) | |
689 | { | |
690 | /* We need handle RX first */ | |
691 | if (events & SPIE_NE) { | |
692 | u32 rx_data = mpc8xxx_spi_read_reg(&mspi->base->receive); | |
693 | ||
694 | if (mspi->rx) | |
695 | mspi->get_rx(rx_data, mspi); | |
ccf06998 KG |
696 | } |
697 | ||
4c1fba44 | 698 | if ((events & SPIE_NF) == 0) |
ccf06998 | 699 | /* spin until TX is done */ |
4c1fba44 AV |
700 | while (((events = |
701 | mpc8xxx_spi_read_reg(&mspi->base->event)) & | |
ccf06998 | 702 | SPIE_NF) == 0) |
9effb959 | 703 | cpu_relax(); |
ccf06998 | 704 | |
4c1fba44 AV |
705 | /* Clear the events */ |
706 | mpc8xxx_spi_write_reg(&mspi->base->event, events); | |
707 | ||
708 | mspi->count -= 1; | |
709 | if (mspi->count) { | |
710 | u32 word = mspi->get_tx(mspi); | |
711 | ||
712 | mpc8xxx_spi_write_reg(&mspi->base->transmit, word); | |
ccf06998 | 713 | } else { |
4c1fba44 | 714 | complete(&mspi->done); |
ccf06998 | 715 | } |
4c1fba44 | 716 | } |
ccf06998 | 717 | |
4c1fba44 AV |
718 | static irqreturn_t mpc8xxx_spi_irq(s32 irq, void *context_data) |
719 | { | |
720 | struct mpc8xxx_spi *mspi = context_data; | |
721 | irqreturn_t ret = IRQ_NONE; | |
722 | u32 events; | |
723 | ||
724 | /* Get interrupt events(tx/rx) */ | |
725 | events = mpc8xxx_spi_read_reg(&mspi->base->event); | |
726 | if (events) | |
727 | ret = IRQ_HANDLED; | |
728 | ||
729 | dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); | |
730 | ||
731 | if (mspi->flags & SPI_CPM_MODE) | |
732 | mpc8xxx_spi_cpm_irq(mspi, events); | |
733 | else | |
734 | mpc8xxx_spi_cpu_irq(mspi, events); | |
ccf06998 KG |
735 | |
736 | return ret; | |
737 | } | |
4c1fba44 | 738 | |
575c5807 | 739 | static int mpc8xxx_spi_transfer(struct spi_device *spi, |
c9bfcb31 JT |
740 | struct spi_message *m) |
741 | { | |
575c5807 | 742 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); |
c9bfcb31 JT |
743 | unsigned long flags; |
744 | ||
745 | m->actual_length = 0; | |
746 | m->status = -EINPROGRESS; | |
747 | ||
575c5807 AV |
748 | spin_lock_irqsave(&mpc8xxx_spi->lock, flags); |
749 | list_add_tail(&m->queue, &mpc8xxx_spi->queue); | |
750 | queue_work(mpc8xxx_spi->workqueue, &mpc8xxx_spi->work); | |
751 | spin_unlock_irqrestore(&mpc8xxx_spi->lock, flags); | |
c9bfcb31 JT |
752 | |
753 | return 0; | |
754 | } | |
755 | ||
756 | ||
575c5807 | 757 | static void mpc8xxx_spi_cleanup(struct spi_device *spi) |
c9bfcb31 JT |
758 | { |
759 | kfree(spi->controller_state); | |
760 | } | |
ccf06998 | 761 | |
4c1fba44 AV |
762 | static void *mpc8xxx_spi_alloc_dummy_rx(void) |
763 | { | |
764 | mutex_lock(&mpc8xxx_dummy_rx_lock); | |
765 | ||
766 | if (!mpc8xxx_dummy_rx) | |
767 | mpc8xxx_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL); | |
768 | if (mpc8xxx_dummy_rx) | |
769 | mpc8xxx_dummy_rx_refcnt++; | |
770 | ||
771 | mutex_unlock(&mpc8xxx_dummy_rx_lock); | |
772 | ||
773 | return mpc8xxx_dummy_rx; | |
774 | } | |
775 | ||
776 | static void mpc8xxx_spi_free_dummy_rx(void) | |
777 | { | |
778 | mutex_lock(&mpc8xxx_dummy_rx_lock); | |
779 | ||
780 | switch (mpc8xxx_dummy_rx_refcnt) { | |
781 | case 0: | |
782 | WARN_ON(1); | |
783 | break; | |
784 | case 1: | |
785 | kfree(mpc8xxx_dummy_rx); | |
786 | mpc8xxx_dummy_rx = NULL; | |
787 | /* fall through */ | |
788 | default: | |
789 | mpc8xxx_dummy_rx_refcnt--; | |
790 | break; | |
791 | } | |
792 | ||
793 | mutex_unlock(&mpc8xxx_dummy_rx_lock); | |
794 | } | |
795 | ||
796 | static unsigned long mpc8xxx_spi_cpm_get_pram(struct mpc8xxx_spi *mspi) | |
797 | { | |
798 | struct device *dev = mspi->dev; | |
799 | struct device_node *np = dev_archdata_get_node(&dev->archdata); | |
800 | const u32 *iprop; | |
801 | int size; | |
802 | unsigned long spi_base_ofs; | |
803 | unsigned long pram_ofs = -ENOMEM; | |
804 | ||
805 | /* Can't use of_address_to_resource(), QE muram isn't at 0. */ | |
806 | iprop = of_get_property(np, "reg", &size); | |
807 | ||
808 | /* QE with a fixed pram location? */ | |
809 | if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4) | |
810 | return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE); | |
811 | ||
812 | /* QE but with a dynamic pram location? */ | |
813 | if (mspi->flags & SPI_QE) { | |
814 | pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); | |
815 | qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock, | |
816 | QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs); | |
817 | return pram_ofs; | |
818 | } | |
819 | ||
820 | /* CPM1 and CPM2 pram must be at a fixed addr. */ | |
821 | if (!iprop || size != sizeof(*iprop) * 4) | |
822 | return -ENOMEM; | |
823 | ||
824 | spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2); | |
825 | if (IS_ERR_VALUE(spi_base_ofs)) | |
826 | return -ENOMEM; | |
827 | ||
828 | if (mspi->flags & SPI_CPM2) { | |
829 | pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); | |
830 | if (!IS_ERR_VALUE(pram_ofs)) { | |
831 | u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs); | |
832 | ||
833 | out_be16(spi_base, pram_ofs); | |
834 | } | |
835 | } else { | |
836 | struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs); | |
837 | u16 rpbase = in_be16(&pram->rpbase); | |
838 | ||
839 | /* Microcode relocation patch applied? */ | |
840 | if (rpbase) | |
841 | pram_ofs = rpbase; | |
842 | else | |
843 | return spi_base_ofs; | |
844 | } | |
845 | ||
846 | cpm_muram_free(spi_base_ofs); | |
847 | return pram_ofs; | |
848 | } | |
849 | ||
850 | static int mpc8xxx_spi_cpm_init(struct mpc8xxx_spi *mspi) | |
851 | { | |
852 | struct device *dev = mspi->dev; | |
853 | struct device_node *np = dev_archdata_get_node(&dev->archdata); | |
854 | const u32 *iprop; | |
855 | int size; | |
856 | unsigned long pram_ofs; | |
857 | unsigned long bds_ofs; | |
858 | ||
859 | if (!(mspi->flags & SPI_CPM_MODE)) | |
860 | return 0; | |
861 | ||
862 | if (!mpc8xxx_spi_alloc_dummy_rx()) | |
863 | return -ENOMEM; | |
864 | ||
865 | if (mspi->flags & SPI_QE) { | |
866 | iprop = of_get_property(np, "cell-index", &size); | |
867 | if (iprop && size == sizeof(*iprop)) | |
868 | mspi->subblock = *iprop; | |
869 | ||
870 | switch (mspi->subblock) { | |
871 | default: | |
872 | dev_warn(dev, "cell-index unspecified, assuming SPI1"); | |
873 | /* fall through */ | |
874 | case 0: | |
875 | mspi->subblock = QE_CR_SUBBLOCK_SPI1; | |
876 | break; | |
877 | case 1: | |
878 | mspi->subblock = QE_CR_SUBBLOCK_SPI2; | |
879 | break; | |
880 | } | |
881 | } | |
882 | ||
883 | pram_ofs = mpc8xxx_spi_cpm_get_pram(mspi); | |
884 | if (IS_ERR_VALUE(pram_ofs)) { | |
885 | dev_err(dev, "can't allocate spi parameter ram\n"); | |
886 | goto err_pram; | |
887 | } | |
888 | ||
889 | bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) + | |
890 | sizeof(*mspi->rx_bd), 8); | |
891 | if (IS_ERR_VALUE(bds_ofs)) { | |
892 | dev_err(dev, "can't allocate bds\n"); | |
893 | goto err_bds; | |
894 | } | |
895 | ||
896 | mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE, | |
897 | DMA_TO_DEVICE); | |
898 | if (dma_mapping_error(dev, mspi->dma_dummy_tx)) { | |
899 | dev_err(dev, "unable to map dummy tx buffer\n"); | |
900 | goto err_dummy_tx; | |
901 | } | |
902 | ||
903 | mspi->dma_dummy_rx = dma_map_single(dev, mpc8xxx_dummy_rx, SPI_MRBLR, | |
904 | DMA_FROM_DEVICE); | |
905 | if (dma_mapping_error(dev, mspi->dma_dummy_rx)) { | |
906 | dev_err(dev, "unable to map dummy rx buffer\n"); | |
907 | goto err_dummy_rx; | |
908 | } | |
909 | ||
910 | mspi->pram = cpm_muram_addr(pram_ofs); | |
911 | ||
912 | mspi->tx_bd = cpm_muram_addr(bds_ofs); | |
913 | mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd)); | |
914 | ||
915 | /* Initialize parameter ram. */ | |
916 | out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd)); | |
917 | out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd)); | |
918 | out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL); | |
919 | out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL); | |
920 | out_be16(&mspi->pram->mrblr, SPI_MRBLR); | |
921 | out_be32(&mspi->pram->rstate, 0); | |
922 | out_be32(&mspi->pram->rdp, 0); | |
923 | out_be16(&mspi->pram->rbptr, 0); | |
924 | out_be16(&mspi->pram->rbc, 0); | |
925 | out_be32(&mspi->pram->rxtmp, 0); | |
926 | out_be32(&mspi->pram->tstate, 0); | |
927 | out_be32(&mspi->pram->tdp, 0); | |
928 | out_be16(&mspi->pram->tbptr, 0); | |
929 | out_be16(&mspi->pram->tbc, 0); | |
930 | out_be32(&mspi->pram->txtmp, 0); | |
931 | ||
932 | return 0; | |
933 | ||
934 | err_dummy_rx: | |
935 | dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); | |
936 | err_dummy_tx: | |
937 | cpm_muram_free(bds_ofs); | |
938 | err_bds: | |
939 | cpm_muram_free(pram_ofs); | |
940 | err_pram: | |
941 | mpc8xxx_spi_free_dummy_rx(); | |
942 | return -ENOMEM; | |
943 | } | |
944 | ||
945 | static void mpc8xxx_spi_cpm_free(struct mpc8xxx_spi *mspi) | |
946 | { | |
947 | struct device *dev = mspi->dev; | |
948 | ||
949 | dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE); | |
950 | dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE); | |
951 | cpm_muram_free(cpm_muram_offset(mspi->tx_bd)); | |
952 | cpm_muram_free(cpm_muram_offset(mspi->pram)); | |
953 | mpc8xxx_spi_free_dummy_rx(); | |
954 | } | |
955 | ||
87ec0e98 AV |
956 | static const char *mpc8xxx_spi_strmode(unsigned int flags) |
957 | { | |
4c1fba44 | 958 | if (flags & SPI_QE_CPU_MODE) { |
87ec0e98 | 959 | return "QE CPU"; |
4c1fba44 AV |
960 | } else if (flags & SPI_CPM_MODE) { |
961 | if (flags & SPI_QE) | |
962 | return "QE"; | |
963 | else if (flags & SPI_CPM2) | |
964 | return "CPM2"; | |
965 | else | |
966 | return "CPM1"; | |
967 | } | |
87ec0e98 AV |
968 | return "CPU"; |
969 | } | |
970 | ||
35b4b3c0 | 971 | static struct spi_master * __devinit |
575c5807 | 972 | mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) |
ccf06998 | 973 | { |
35b4b3c0 | 974 | struct fsl_spi_platform_data *pdata = dev->platform_data; |
ccf06998 | 975 | struct spi_master *master; |
575c5807 | 976 | struct mpc8xxx_spi *mpc8xxx_spi; |
ccf06998 KG |
977 | u32 regval; |
978 | int ret = 0; | |
979 | ||
575c5807 | 980 | master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); |
ccf06998 KG |
981 | if (master == NULL) { |
982 | ret = -ENOMEM; | |
983 | goto err; | |
984 | } | |
985 | ||
35b4b3c0 | 986 | dev_set_drvdata(dev, master); |
ccf06998 | 987 | |
e7db06b5 DB |
988 | /* the spi->mode bits understood by this driver: */ |
989 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | |
990 | | SPI_LSB_FIRST | SPI_LOOP; | |
991 | ||
575c5807 AV |
992 | master->setup = mpc8xxx_spi_setup; |
993 | master->transfer = mpc8xxx_spi_transfer; | |
994 | master->cleanup = mpc8xxx_spi_cleanup; | |
995 | ||
996 | mpc8xxx_spi = spi_master_get_devdata(master); | |
4c1fba44 | 997 | mpc8xxx_spi->dev = dev; |
575c5807 AV |
998 | mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8; |
999 | mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8; | |
87ec0e98 | 1000 | mpc8xxx_spi->flags = pdata->flags; |
575c5807 AV |
1001 | mpc8xxx_spi->spibrg = pdata->sysclk; |
1002 | ||
4c1fba44 AV |
1003 | ret = mpc8xxx_spi_cpm_init(mpc8xxx_spi); |
1004 | if (ret) | |
1005 | goto err_cpm_init; | |
1006 | ||
575c5807 AV |
1007 | mpc8xxx_spi->rx_shift = 0; |
1008 | mpc8xxx_spi->tx_shift = 0; | |
87ec0e98 | 1009 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { |
575c5807 AV |
1010 | mpc8xxx_spi->rx_shift = 16; |
1011 | mpc8xxx_spi->tx_shift = 24; | |
f29ba280 JT |
1012 | } |
1013 | ||
575c5807 | 1014 | init_completion(&mpc8xxx_spi->done); |
ccf06998 | 1015 | |
82de7651 | 1016 | mpc8xxx_spi->base = ioremap(mem->start, resource_size(mem)); |
575c5807 | 1017 | if (mpc8xxx_spi->base == NULL) { |
ccf06998 | 1018 | ret = -ENOMEM; |
4c1fba44 | 1019 | goto err_ioremap; |
ccf06998 KG |
1020 | } |
1021 | ||
575c5807 | 1022 | mpc8xxx_spi->irq = irq; |
ccf06998 KG |
1023 | |
1024 | /* Register for SPI Interrupt */ | |
575c5807 AV |
1025 | ret = request_irq(mpc8xxx_spi->irq, mpc8xxx_spi_irq, |
1026 | 0, "mpc8xxx_spi", mpc8xxx_spi); | |
ccf06998 KG |
1027 | |
1028 | if (ret != 0) | |
1029 | goto unmap_io; | |
1030 | ||
1031 | master->bus_num = pdata->bus_num; | |
1032 | master->num_chipselect = pdata->max_chipselect; | |
1033 | ||
1034 | /* SPI controller initializations */ | |
575c5807 AV |
1035 | mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, 0); |
1036 | mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0); | |
1037 | mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->command, 0); | |
1038 | mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->event, 0xffffffff); | |
ccf06998 KG |
1039 | |
1040 | /* Enable SPI interface */ | |
1041 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; | |
87ec0e98 | 1042 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) |
f29ba280 JT |
1043 | regval |= SPMODE_OP; |
1044 | ||
575c5807 AV |
1045 | mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, regval); |
1046 | spin_lock_init(&mpc8xxx_spi->lock); | |
1047 | init_completion(&mpc8xxx_spi->done); | |
1048 | INIT_WORK(&mpc8xxx_spi->work, mpc8xxx_spi_work); | |
1049 | INIT_LIST_HEAD(&mpc8xxx_spi->queue); | |
ccf06998 | 1050 | |
575c5807 | 1051 | mpc8xxx_spi->workqueue = create_singlethread_workqueue( |
6c7377ab | 1052 | dev_name(master->dev.parent)); |
575c5807 | 1053 | if (mpc8xxx_spi->workqueue == NULL) { |
c9bfcb31 | 1054 | ret = -EBUSY; |
ccf06998 | 1055 | goto free_irq; |
c9bfcb31 JT |
1056 | } |
1057 | ||
1058 | ret = spi_register_master(master); | |
1059 | if (ret < 0) | |
1060 | goto unreg_master; | |
ccf06998 | 1061 | |
87ec0e98 AV |
1062 | dev_info(dev, "at 0x%p (irq = %d), %s mode\n", mpc8xxx_spi->base, |
1063 | mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); | |
ccf06998 | 1064 | |
35b4b3c0 | 1065 | return master; |
ccf06998 | 1066 | |
c9bfcb31 | 1067 | unreg_master: |
575c5807 | 1068 | destroy_workqueue(mpc8xxx_spi->workqueue); |
ccf06998 | 1069 | free_irq: |
575c5807 | 1070 | free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); |
ccf06998 | 1071 | unmap_io: |
575c5807 | 1072 | iounmap(mpc8xxx_spi->base); |
4c1fba44 AV |
1073 | err_ioremap: |
1074 | mpc8xxx_spi_cpm_free(mpc8xxx_spi); | |
1075 | err_cpm_init: | |
ccf06998 | 1076 | spi_master_put(master); |
ccf06998 | 1077 | err: |
35b4b3c0 | 1078 | return ERR_PTR(ret); |
ccf06998 KG |
1079 | } |
1080 | ||
575c5807 | 1081 | static int __devexit mpc8xxx_spi_remove(struct device *dev) |
ccf06998 | 1082 | { |
575c5807 | 1083 | struct mpc8xxx_spi *mpc8xxx_spi; |
ccf06998 KG |
1084 | struct spi_master *master; |
1085 | ||
35b4b3c0 | 1086 | master = dev_get_drvdata(dev); |
575c5807 | 1087 | mpc8xxx_spi = spi_master_get_devdata(master); |
ccf06998 | 1088 | |
575c5807 AV |
1089 | flush_workqueue(mpc8xxx_spi->workqueue); |
1090 | destroy_workqueue(mpc8xxx_spi->workqueue); | |
c9bfcb31 JT |
1091 | spi_unregister_master(master); |
1092 | ||
575c5807 AV |
1093 | free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); |
1094 | iounmap(mpc8xxx_spi->base); | |
4c1fba44 | 1095 | mpc8xxx_spi_cpm_free(mpc8xxx_spi); |
ccf06998 KG |
1096 | |
1097 | return 0; | |
1098 | } | |
1099 | ||
575c5807 | 1100 | struct mpc8xxx_spi_probe_info { |
35b4b3c0 AV |
1101 | struct fsl_spi_platform_data pdata; |
1102 | int *gpios; | |
1103 | bool *alow_flags; | |
1104 | }; | |
1105 | ||
575c5807 | 1106 | static struct mpc8xxx_spi_probe_info * |
35b4b3c0 AV |
1107 | to_of_pinfo(struct fsl_spi_platform_data *pdata) |
1108 | { | |
575c5807 | 1109 | return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata); |
35b4b3c0 AV |
1110 | } |
1111 | ||
575c5807 | 1112 | static void mpc8xxx_spi_cs_control(struct spi_device *spi, bool on) |
35b4b3c0 AV |
1113 | { |
1114 | struct device *dev = spi->dev.parent; | |
575c5807 | 1115 | struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data); |
35b4b3c0 AV |
1116 | u16 cs = spi->chip_select; |
1117 | int gpio = pinfo->gpios[cs]; | |
1118 | bool alow = pinfo->alow_flags[cs]; | |
1119 | ||
1120 | gpio_set_value(gpio, on ^ alow); | |
1121 | } | |
1122 | ||
575c5807 | 1123 | static int of_mpc8xxx_spi_get_chipselects(struct device *dev) |
35b4b3c0 AV |
1124 | { |
1125 | struct device_node *np = dev_archdata_get_node(&dev->archdata); | |
1126 | struct fsl_spi_platform_data *pdata = dev->platform_data; | |
575c5807 | 1127 | struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); |
35b4b3c0 AV |
1128 | unsigned int ngpios; |
1129 | int i = 0; | |
1130 | int ret; | |
1131 | ||
1132 | ngpios = of_gpio_count(np); | |
1133 | if (!ngpios) { | |
1134 | /* | |
1135 | * SPI w/o chip-select line. One SPI device is still permitted | |
1136 | * though. | |
1137 | */ | |
1138 | pdata->max_chipselect = 1; | |
1139 | return 0; | |
1140 | } | |
1141 | ||
02141546 | 1142 | pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL); |
35b4b3c0 AV |
1143 | if (!pinfo->gpios) |
1144 | return -ENOMEM; | |
02141546 | 1145 | memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios)); |
35b4b3c0 | 1146 | |
02141546 | 1147 | pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags), |
35b4b3c0 AV |
1148 | GFP_KERNEL); |
1149 | if (!pinfo->alow_flags) { | |
1150 | ret = -ENOMEM; | |
1151 | goto err_alloc_flags; | |
1152 | } | |
1153 | ||
1154 | for (; i < ngpios; i++) { | |
1155 | int gpio; | |
1156 | enum of_gpio_flags flags; | |
1157 | ||
1158 | gpio = of_get_gpio_flags(np, i, &flags); | |
1159 | if (!gpio_is_valid(gpio)) { | |
1160 | dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); | |
783058fd | 1161 | ret = gpio; |
35b4b3c0 AV |
1162 | goto err_loop; |
1163 | } | |
1164 | ||
1165 | ret = gpio_request(gpio, dev_name(dev)); | |
1166 | if (ret) { | |
1167 | dev_err(dev, "can't request gpio #%d: %d\n", i, ret); | |
1168 | goto err_loop; | |
1169 | } | |
1170 | ||
1171 | pinfo->gpios[i] = gpio; | |
1172 | pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW; | |
1173 | ||
1174 | ret = gpio_direction_output(pinfo->gpios[i], | |
1175 | pinfo->alow_flags[i]); | |
1176 | if (ret) { | |
1177 | dev_err(dev, "can't set output direction for gpio " | |
1178 | "#%d: %d\n", i, ret); | |
1179 | goto err_loop; | |
1180 | } | |
1181 | } | |
1182 | ||
1183 | pdata->max_chipselect = ngpios; | |
575c5807 | 1184 | pdata->cs_control = mpc8xxx_spi_cs_control; |
35b4b3c0 AV |
1185 | |
1186 | return 0; | |
1187 | ||
1188 | err_loop: | |
1189 | while (i >= 0) { | |
1190 | if (gpio_is_valid(pinfo->gpios[i])) | |
1191 | gpio_free(pinfo->gpios[i]); | |
1192 | i--; | |
1193 | } | |
1194 | ||
1195 | kfree(pinfo->alow_flags); | |
1196 | pinfo->alow_flags = NULL; | |
1197 | err_alloc_flags: | |
1198 | kfree(pinfo->gpios); | |
1199 | pinfo->gpios = NULL; | |
1200 | return ret; | |
1201 | } | |
1202 | ||
575c5807 | 1203 | static int of_mpc8xxx_spi_free_chipselects(struct device *dev) |
35b4b3c0 AV |
1204 | { |
1205 | struct fsl_spi_platform_data *pdata = dev->platform_data; | |
575c5807 | 1206 | struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); |
35b4b3c0 AV |
1207 | int i; |
1208 | ||
1209 | if (!pinfo->gpios) | |
1210 | return 0; | |
1211 | ||
1212 | for (i = 0; i < pdata->max_chipselect; i++) { | |
1213 | if (gpio_is_valid(pinfo->gpios[i])) | |
1214 | gpio_free(pinfo->gpios[i]); | |
1215 | } | |
1216 | ||
1217 | kfree(pinfo->gpios); | |
1218 | kfree(pinfo->alow_flags); | |
1219 | return 0; | |
1220 | } | |
1221 | ||
575c5807 | 1222 | static int __devinit of_mpc8xxx_spi_probe(struct of_device *ofdev, |
35b4b3c0 AV |
1223 | const struct of_device_id *ofid) |
1224 | { | |
1225 | struct device *dev = &ofdev->dev; | |
1226 | struct device_node *np = ofdev->node; | |
575c5807 | 1227 | struct mpc8xxx_spi_probe_info *pinfo; |
35b4b3c0 AV |
1228 | struct fsl_spi_platform_data *pdata; |
1229 | struct spi_master *master; | |
1230 | struct resource mem; | |
1231 | struct resource irq; | |
1232 | const void *prop; | |
1233 | int ret = -ENOMEM; | |
1234 | ||
1235 | pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL); | |
1236 | if (!pinfo) | |
1237 | return -ENOMEM; | |
1238 | ||
1239 | pdata = &pinfo->pdata; | |
1240 | dev->platform_data = pdata; | |
1241 | ||
1242 | /* Allocate bus num dynamically. */ | |
1243 | pdata->bus_num = -1; | |
1244 | ||
1245 | /* SPI controller is either clocked from QE or SoC clock. */ | |
1246 | pdata->sysclk = get_brgfreq(); | |
1247 | if (pdata->sysclk == -1) { | |
1248 | pdata->sysclk = fsl_get_sys_freq(); | |
1249 | if (pdata->sysclk == -1) { | |
1250 | ret = -ENODEV; | |
1251 | goto err_clk; | |
1252 | } | |
1253 | } | |
1254 | ||
1255 | prop = of_get_property(np, "mode", NULL); | |
1256 | if (prop && !strcmp(prop, "cpu-qe")) | |
87ec0e98 | 1257 | pdata->flags = SPI_QE_CPU_MODE; |
4c1fba44 AV |
1258 | else if (prop && !strcmp(prop, "qe")) |
1259 | pdata->flags = SPI_CPM_MODE | SPI_QE; | |
1260 | else if (of_device_is_compatible(np, "fsl,cpm2-spi")) | |
1261 | pdata->flags = SPI_CPM_MODE | SPI_CPM2; | |
1262 | else if (of_device_is_compatible(np, "fsl,cpm1-spi")) | |
1263 | pdata->flags = SPI_CPM_MODE | SPI_CPM1; | |
35b4b3c0 | 1264 | |
575c5807 | 1265 | ret = of_mpc8xxx_spi_get_chipselects(dev); |
35b4b3c0 AV |
1266 | if (ret) |
1267 | goto err; | |
1268 | ||
1269 | ret = of_address_to_resource(np, 0, &mem); | |
1270 | if (ret) | |
1271 | goto err; | |
1272 | ||
1273 | ret = of_irq_to_resource(np, 0, &irq); | |
1274 | if (!ret) { | |
1275 | ret = -EINVAL; | |
1276 | goto err; | |
1277 | } | |
1278 | ||
575c5807 | 1279 | master = mpc8xxx_spi_probe(dev, &mem, irq.start); |
35b4b3c0 AV |
1280 | if (IS_ERR(master)) { |
1281 | ret = PTR_ERR(master); | |
1282 | goto err; | |
1283 | } | |
1284 | ||
1285 | of_register_spi_devices(master, np); | |
1286 | ||
1287 | return 0; | |
1288 | ||
1289 | err: | |
575c5807 | 1290 | of_mpc8xxx_spi_free_chipselects(dev); |
35b4b3c0 AV |
1291 | err_clk: |
1292 | kfree(pinfo); | |
1293 | return ret; | |
1294 | } | |
1295 | ||
575c5807 | 1296 | static int __devexit of_mpc8xxx_spi_remove(struct of_device *ofdev) |
35b4b3c0 AV |
1297 | { |
1298 | int ret; | |
1299 | ||
575c5807 | 1300 | ret = mpc8xxx_spi_remove(&ofdev->dev); |
35b4b3c0 AV |
1301 | if (ret) |
1302 | return ret; | |
575c5807 | 1303 | of_mpc8xxx_spi_free_chipselects(&ofdev->dev); |
35b4b3c0 AV |
1304 | return 0; |
1305 | } | |
1306 | ||
575c5807 | 1307 | static const struct of_device_id of_mpc8xxx_spi_match[] = { |
35b4b3c0 AV |
1308 | { .compatible = "fsl,spi" }, |
1309 | {}, | |
1310 | }; | |
575c5807 | 1311 | MODULE_DEVICE_TABLE(of, of_mpc8xxx_spi_match); |
35b4b3c0 | 1312 | |
575c5807 AV |
1313 | static struct of_platform_driver of_mpc8xxx_spi_driver = { |
1314 | .name = "mpc8xxx_spi", | |
1315 | .match_table = of_mpc8xxx_spi_match, | |
1316 | .probe = of_mpc8xxx_spi_probe, | |
1317 | .remove = __devexit_p(of_mpc8xxx_spi_remove), | |
35b4b3c0 AV |
1318 | }; |
1319 | ||
1320 | #ifdef CONFIG_MPC832x_RDB | |
1321 | /* | |
1322 | * XXX XXX XXX | |
1323 | * This is "legacy" platform driver, was used by the MPC8323E-RDB boards | |
1324 | * only. The driver should go away soon, since newer MPC8323E-RDB's device | |
1325 | * tree can work with OpenFirmware driver. But for now we support old trees | |
1326 | * as well. | |
1327 | */ | |
575c5807 | 1328 | static int __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev) |
35b4b3c0 AV |
1329 | { |
1330 | struct resource *mem; | |
e9a172f0 | 1331 | int irq; |
35b4b3c0 AV |
1332 | struct spi_master *master; |
1333 | ||
1334 | if (!pdev->dev.platform_data) | |
1335 | return -EINVAL; | |
1336 | ||
1337 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1338 | if (!mem) | |
1339 | return -EINVAL; | |
1340 | ||
1341 | irq = platform_get_irq(pdev, 0); | |
e9a172f0 | 1342 | if (irq <= 0) |
35b4b3c0 AV |
1343 | return -EINVAL; |
1344 | ||
575c5807 | 1345 | master = mpc8xxx_spi_probe(&pdev->dev, mem, irq); |
35b4b3c0 AV |
1346 | if (IS_ERR(master)) |
1347 | return PTR_ERR(master); | |
1348 | return 0; | |
1349 | } | |
1350 | ||
575c5807 | 1351 | static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev) |
35b4b3c0 | 1352 | { |
575c5807 | 1353 | return mpc8xxx_spi_remove(&pdev->dev); |
35b4b3c0 AV |
1354 | } |
1355 | ||
575c5807 AV |
1356 | MODULE_ALIAS("platform:mpc8xxx_spi"); |
1357 | static struct platform_driver mpc8xxx_spi_driver = { | |
1358 | .probe = plat_mpc8xxx_spi_probe, | |
b3a08945 | 1359 | .remove = __devexit_p(plat_mpc8xxx_spi_remove), |
ccf06998 | 1360 | .driver = { |
575c5807 | 1361 | .name = "mpc8xxx_spi", |
7e38c3c4 | 1362 | .owner = THIS_MODULE, |
ccf06998 KG |
1363 | }, |
1364 | }; | |
1365 | ||
35b4b3c0 AV |
1366 | static bool legacy_driver_failed; |
1367 | ||
1368 | static void __init legacy_driver_register(void) | |
1369 | { | |
575c5807 | 1370 | legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); |
35b4b3c0 AV |
1371 | } |
1372 | ||
1373 | static void __exit legacy_driver_unregister(void) | |
1374 | { | |
1375 | if (legacy_driver_failed) | |
1376 | return; | |
575c5807 | 1377 | platform_driver_unregister(&mpc8xxx_spi_driver); |
35b4b3c0 AV |
1378 | } |
1379 | #else | |
1380 | static void __init legacy_driver_register(void) {} | |
1381 | static void __exit legacy_driver_unregister(void) {} | |
1382 | #endif /* CONFIG_MPC832x_RDB */ | |
1383 | ||
575c5807 | 1384 | static int __init mpc8xxx_spi_init(void) |
ccf06998 | 1385 | { |
35b4b3c0 | 1386 | legacy_driver_register(); |
575c5807 | 1387 | return of_register_platform_driver(&of_mpc8xxx_spi_driver); |
ccf06998 KG |
1388 | } |
1389 | ||
575c5807 | 1390 | static void __exit mpc8xxx_spi_exit(void) |
ccf06998 | 1391 | { |
575c5807 | 1392 | of_unregister_platform_driver(&of_mpc8xxx_spi_driver); |
35b4b3c0 | 1393 | legacy_driver_unregister(); |
ccf06998 KG |
1394 | } |
1395 | ||
575c5807 AV |
1396 | module_init(mpc8xxx_spi_init); |
1397 | module_exit(mpc8xxx_spi_exit); | |
ccf06998 KG |
1398 | |
1399 | MODULE_AUTHOR("Kumar Gala"); | |
575c5807 | 1400 | MODULE_DESCRIPTION("Simple MPC8xxx SPI Driver"); |
ccf06998 | 1401 | MODULE_LICENSE("GPL"); |